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If 'BOOK' is coded as 'CPPL', then 'PEN' is coded as:
AQFO
BRGP
COFM
DPFN
Answer & Solution
Correct answer: A. QFO
1. BOOK → CPPL: each letter +1.
2. PEN: P→Q, E→F, N→O.
3. = QFO.
_Source: jkchrome Coding-Decoding, p.4 — +1 cipher_
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